i took admission in 12th class in patrachar vidyalaya shalimar bagh in 2011.my main exams were in 2012.
subjects english,hindi,history,political,economics.
now i was able to give all papers except economics paper due to jaundice and got compartment in it.the first compartment exam was in 15 july 2012,second exam was in march 2013,then third exam in 15 july 2013, in all three atempts i got compartment,i try its just i m not able to understand it.my father ashamed of me.i had a few questions i needed help with because either CBSE or parchar vidayala aren't clear about information and aren't helpful.i would be really grateful if somone can answer my question's,help me

1.i had heard that you have only three compartment attempts but i still got compartment 4th time.so m i still able to give this exam 4th time.
2.can i change my economics subject now.through subject change form.or any other way

Thank you